/*
 * JSF Toolkit Component Framework
 * Copyright (C) 2007 Noah Sloan <iamnoah A-T gmail D0T com>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 */
package com.jsftoolkit.utils;

import java.io.IOException;
import java.io.Reader;

/**
 * Reader wrapper that keeps track of whether the end of stream has been
 * reached.
 * 
 * @author noah
 * 
 */
public class IsFinishedReader extends Reader {

	private final Reader reader;

	private boolean finished;

	public IsFinishedReader(Reader reader) {
		super();
		this.reader = reader;
	}

	@Override
	public void close() throws IOException {
		finished = true;
		reader.close();
	}

	@Override
	public int read() throws IOException {
		return check(reader.read());
	}

	@Override
	public int read(char[] cbuf) throws IOException {
		return check(reader.read(cbuf));
	}

	@Override
	public int read(char[] cbuf, int off, int len) throws IOException {
		return check(reader.read(cbuf, off, len));
	}

	private int check(int read) {
		finished = (read == -1);
		return read;
	}

	/**
	 * 
	 * @return true if the EOS was reached or the stream has been closed.
	 */
	public boolean isFinished() {
		return finished;
	}
}
